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1972 250c Engine noise

3953 Views 13 Replies 6 Participants Last post by  agillot
Just purchased a 1972 250c, overall good shape, however engine makes a knocking sound. The previous owner said that a head job was done (doubt it), but could it be possible that the job was done incorrectly? Also, what could be the most probable cause for an engine to knock?

If so, is this particular engine hard to rebuilt?

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from wiki, yes the 250C all had 2.8 M130 engine

Chassis code Years Model Engine Number built[6]
Displacement Model Type
W114.015 1968–1976 230, 230.6 2.3 L M180 I6 221,783
W114.01333 1968–1972 250 2.5 L M114 I6 78,303
W114.011 1972–1976 250 2.8 2.8 L M130 I6 34,061
W114.023/022 1969–1976 250C/CE 2.8 L M130 I6 42,379
W114.060/062 1972–1976 280/E 2.8 L M110 I6 67,373
W114.073/072 1972–1976 280C/CE 2.8 L M110 I6 24,669
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